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大山铺恐龙动物群产于中侏罗统下沙溪庙组中,该组为一套陆源碎屑沉积,以紫红色泥岩为主,夹有多层浅灰绿色中一微粒砂岩和粉砂岩,属河流相和湖泊相交替沉积。恐龙动物群赋存于微粒长石岩屑砂岩中,砂岩富含云母片,杂基填隙,浪成沙纹层理和微波状层理发育,并具中一大型板状交错层理,属低能湖滨浅滩沉积。当时恐龙生活于水,草丰茂的湖滨平原上,因食富砷植物引起中毒并导致恐龙大批死亡,遗体埋藏于湖滨浅滩中。异常死亡和原地埋藏于低能浅滩,这是造成本区恐龙化石的数量丰富和保存完整的根本原因。
The Dashanpu dinosaur fauna is found in the Xisha Shaximiao Formation of the Middle Jurassic, a set of terrigenous clastic sediments dominated by purplish red mudstone with multiple layers of light gray-green medium-fine sandstone and siltstone Alternate deposition of river facies and lakes. The dinosaur fauna occurs in fine-grained feldspathic lithic sandstone that is rich in mica flakes, miscellaneous interstitial spaces, wavy sand-grained bedding, and microwave-like bedding. Low-lying lake shoal deposition. At that time, dinosaurs lived on watery and grassy lakeside plains, causing poisoning caused by food-rich arsenic and causing a large number of dinosaurs to die. Their remains were buried in shoal shores. Abnormal death and in-situ buried in the low-energy shoal, which is the root cause of abundance and preservation of dinosaur fossils in this area.